/in/foo.cc: In function 'int main()':
/in/foo.cc:14:10: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   14 | for(i=0;i<strlen(a);i++)
      |         ~^~~~~~~~~~
/in/foo.cc:12:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 | scanf("%s",a) ;
      | ~~~~~^~~~~~~~